jaevis adams



Paten-ted Jan. 31, 18.88.

S. J. ADAMS. METHOD 0T WITHDRAWING PATTERNS PRoM SAND MOLDS f (No Model.)

N. PETERS Phololihograplllr. Wuhingion. DV CY lUNrTEDy STATES S. JARVIS ADAMS, OF'PIITSBURG, PENNSYLVANIA.

PATENT Price, l`

METHOD oF WITHDRAWING PATTERNS FROM SAND MoLDs'.

SPECIFICATION-forming part of Lettersratem No, 377.010,datea January 371l 1888. v

Original application filed January 27, 1885, Serial No. 154,153. Divided and this application` filed November l, 1887.

253,073. (No model.)

T0 all whom it may cancel/'mf Be it known that S. J Aravis ADAMS, of Pittsburg,in the county of Allegheny and State of Pennsylvania, have invent-ed a new and useful Improvement in Withdrawing Patterns more. especially to heavy patterns which are difficult to withdraw by hand, this application being a division of one filed by me January 27, 1885, Serial No. 154,153.

Two methods haveheretofore usually been employed for withdrawing patterns from the mold, one consisting in lifting the pattern out ofthe mold by hand, which with large heavyy patterns is difficult to do Without brcakingor injuring the walls ofthe mold, and the other in the use of amachine. In the former case the difficulty is particularly'noticeable where great accuracy is required, as in making mandrels or balls for the manufacture of wroughtmetal tubing, the surfaces of which are parallel and which are condemnedif out of round one-hundredth of an inch. In withdrawing by hand it is almost impossible to make a true mold, as there is always liability to press or dragon one sideof the mold, more than the other,so enlarging it and `making i t oblong. In

the latter case, withdrawing by machinery, asy

the ywithdrawal of the pattern from the mold is regulated by the guidesof the withdrawing apparatus, unless these guides are in accurate alignment with the lines of the mold, the pattern will in its withdrawal break the walls of In the prac-v tical use of these machines itis impossible to the mold or enlarge the latter.

prevent the wearofy the guides, as the sand from the molds accumulates on the guides and soon causes them to become worn out of align ment, which, as heretofore stated, injures the mold in the withdrawal of the pattern therefrom. There is also liability of the pattern or flask not havingra true' surface, or of sand falling or working-in between the pattern, its supporting-plate, or the vguides in such manl yner as to throw the patterns-out of proper line with the guides, .and in large patterns the Serial No.'

slightest variation at the base will throw'the 'i top considerably' out of line. There is also danger of numerousaccidents, inattention, or

carelessness of the molder and like matters to' g i contend with. These in the making ,of accurate castings are serious defects,as the molder, even when careful, Vcannot be certain that in` withdrawing his pattern by the machine the sizeof the mold will not he enlarged or the mold be made oblong.

Y'Ihe object of` my,v invention is to, provide a method of withdrawing the pattern by which any possibility of 'injury to the walls ofthe moldor'ils enlargement is avoided, as the ,withdrawal of thepattern is guided entirely yby the walls of the mold. Y

- To this end my invention consists in dropping the pattern from the mold by itsown weight and guiding its withdrawal by they walls of the mold only. y

To enable othersskilled in the art to make and use my invention, l will describe the same,

more fully, referring to-the accompanying drawings, in wllich- Figure 1 is a central vertical section ofa vmold and pattern ready to be dropped, andV FigfZ showsrthe pattern dropped from the figures.

The sand molds may be packed in any suit- `able manner, either by ramming, iarring, or'- pressing, and with long narrow molds they are generally formed in a single flask, a, the pat# terns, b usually extending up into the flasklargest diameter, but does not bear against they surfacef thepattcrn, so as to guide it when moving from the mold, but' acts solely to sup-y port the sand mold `in the flask around-thesharp edges of the pattern when it is with-v drawn. essential, as the binding of the sand'ofY the mold on the interior walls of the flask is sufficient to hold the mold therein,'thoughk Vit is Ithrougha stripping or supporting plate, c, which generally surrounds the `pattern at its f The stripping-plate is not absolutely preferable to employ thestripping-plate,Yas it v avoids 'any possibilityof the mold comingout of the iask.y Any suitable form of table may be used to IOO support the flask While the pattern is being dropped from the mold. That shown in the drawingsis simple in construction and satisfactoryv in use. It consists of a frame, d, supported on standards d', on which frame the stripping-plate crests, leaving the pattern unsupported by the table itself. The pattern is held in the mold until it is ready to be dropped either by the hand of the molder or other suitxo able support, or, as in most cases, by the adhesion of the sand of the mold on the surfaces of the pattern.

In order to provide a cushion for the reception of the falling pattern, and thus prevent I5 its injury by impact on` the floor, a cushion, f, is placed under the dropping-table. This cushionf may be of any suitable construction, two forms being shown in the drawings, one consisting of a spring-mattress, as in Fig. 2, and the other of a body of sand placed loosely on the floor, or inclosed within a cover, which is preferably supported on an adjustable table or platform, g, under the dropping table, which platform, for the purpose of limiting the length of the fall of the pattern, is vertically adjustable by means of the SetscreWg, bearing on the shank h on the under side of the platform.

In carrying out the process, themold having been madein the flask, the latter is carried by the melder to the table, he so holding the flask that the pattern will maintain its position iu the mold, the adhesion ofthe sand of the mold on the surface of the pattern being ordinarily sufcient for this purpose.

The ask is set by the molder on the dropping-table with the large exposed end of the pattern down, and if, when he takes his handv from under the pattern, the latter does not 4o drop from the mold, an initial movement is imparted, by hand or otherwise, to the pattern to overcome the adhesion ofthe sand thereto. For this purpose the pattern may be provided with a rod, t', which extends up through the mold, or asharp thin bar can be thrust through that portion of the mold immediately over the crown of the pattern for imparting this initial movement; or the pattern may be turned slightly in the mold, when it Will freely leave the mold.

In falling from the mold, the pattern is guided entirely by the walls of the mold inits descent, and therefore there is vno liability of the walls of the mold being broken or the mold-cavity being enlarged or injured by the pattern pressing against one side or the other, which A.would be the case were a machine used which Was not properly adjusted, or in case the guides of the withdrawing table or plate were not in alignment with the lines of the mold.

I have found, practically, that the attraction of gravitation or the Weight of the pattern acts perfectly to withdraw the pattern. The walls of the mold also form the most perfect guide for its Withdrawal which can be obtained, each mold thnsforniing an independent guide for the withdrawal of the pattern, which cannot be affected by Wear, as in machine guides, and even it' the pattern is not in perfect line With the supporting -table the walls of the mold-forni will guide the pattern perfectly as it drops without injuring the mold.

I do not claim in this application a pattern having a rod extending up through the mold, as thatforms the subjecthmtter of a separate application by me, Serial No. 151,153, tiled January 27, 1885, of which application this is a division.

Having now described my invention,wl1at[ claim is- The method herein described of withdrawing patterns from sand molds, consisting in dropping the pattern from the mold and guiding such Withdrawal only by the walls ot' the mold-form.

In testimony whereof I, the said S. JARVIs ADAMS, have hereunto set my hand.

S. JARVIS ADAMS.

Xifitnesses:

J AMEs I. KAY, RoBT. D. TOTTEN. 

